<template>
  <div>

    <van-list
        v-model="loading"
        :finished="finished"
        finished-text="没有更多了"
        @load="onLoad"
        offset="50"
        :immediate-check="false"
      >
    <!-- 评论列表 -->
    <div class="cmt-list"     :class="isshow? 'box1' :'box2'">
      <!-- 评论的 Item 项 -->
      <div class="cmt-item"  v-for="obj in commenlist "  :key="obj.com_id"  >
        <!-- 头部区域 -->
        <div class="cmt-header">
          <!-- 头部左侧 -->
          <div class="cmt-header-left">
            <img :src="obj.aut_photo" alt="avta" class="avatar">
            <span class="uname">{{obj.aut_name}}</span>
          </div>
          <!-- 头部右侧 -->
          <div class="cmt-header-right">
            <van-icon name="like"
             size="16" color="red"   v-if="obj.is_liking"
              @click="likeOrDislikeFn(obj)"
              />

            <van-icon name="like-o"
             size="16" color="gray" v-else
               @click="likeOrDislikeFn(obj)"
              />
          </div>
        </div>
        <!-- 主体区域 -->
        <div class="cmt-body">
          {{obj.content}}
          基于字体的图标集
        </div>
        <!-- 尾部区域 -->
    <div class="cmt-footer"> {{ $timeAgo(obj.pubdate)    }}</div>
      </div>
    </div>
    </van-list>
    <!-- 底部添加评论区域 - 1 -->
<div class="add-cmt-box van-hairline--top"  v-if='isshow' >
  <van-icon name="arrow-left" size="0.48rem" @click="$router.back()"      />
  <div class="ipt-cmt-div"    @click="isshow=0"      >发表评论</div>
  <div class="icon-box">
    <van-badge     :content="toast" max="10"  >
      <van-icon name="comment-o" size="0.53333334rem"   @click="scrollFn"    />
    </van-badge>
    <van-icon name="star-o" size="0.53333334rem" />
    <van-icon name="share-o" size="0.53333334rem" />
  </div>
</div>

<!-- 底部添加评论区域 - 2 -->
<div class="cmt-box van-hairline--top"  v-else  >
  <textarea placeholder="友善评论、理性发言、阳光心灵"
   v-focus
  @blur="onblurfn"
  v-model.trim.lazy="content"
  ></textarea>
  <van-button type="default" @click="publishFn">发布</van-button>
</div>
  </div>
</template>

<script>

import {
  getArticleCommentAPI,
  likeCommentAPI,
  dislikeCommentAPI,
  publishCommentAPI
} from '@/api/article'
export default {
  data () {
    return {
      commenlist: [], // 评论列票
      isshow: true, // 盒子互斥
      toast: null, // 评论数量
      content: '', // 评论内容
      loading: false, // 底部加载状态
      finished: false, // 底部是否加载完成
      offset: null // 下一页(偏移id),
    }
  },
  //  评论
  async created () {
    const res = await getArticleCommentAPI({ articleld: this.$route.query.art_id, offset: this.offset })
    const { last_id, results, total_count } = res.data
    this.offset = last_id
    this.commenlist = results
    this.toast = total_count || null
  },
  methods: {
    // 点小红心心
    async    likeOrDislikeFn (obj) {
      try {
        obj.is_liking ? await dislikeCommentAPI({
          commentid: obj.com_id
        }) : await likeCommentAPI({
          commentid: obj.com_id
        })
        this.$toast.success(obj.is_liking ? '点成功' : '点取消')
        obj.is_liking = !obj.is_liking
      } catch (e) {
        this.$toast.fail(obj.is_liking ? 'qu成功' : 'qu取消')
      }
    },
    // 滚动
    scrollFn () {
      const el = document.querySelector('div .like-box')
      el.scrollIntoView({ behavior: 'smooth' })
    },
    // 点发布
    async  publishFn () {
      if (!this.content) return
      console.log('1')
      const res = await publishCommentAPI({
        articleld: this.$route.query.art_id,
        content: this.content
      })
      this.commenlist.unshift(res.data.new_obj)
      this.content = ''
    },
    // 失去焦点  异步代码
    onblurfn () {
      setTimeout(() => {
        this.isshow = true
      })
    },
    // 更多平论
    async   onLoad () {
      console.log('1')
      const res = await getArticleCommentAPI({ articleld: this.$route.query.art_id, offset: this.offset })
      const { last_id, results, total_count } = res.data
      console.log(res)
      if (results.length === 0) {
        this.finished = true
        this.commenlist = [...this.commenlist, ...results]
        return
      }
      this.offset = last_id
      this.commenlist = [...this.commenlist, ...results]
      this.toast = total_count || null
      this.loading = false
    }
  }
}
</script>

<style scoped lang="less">
.cmt-list {
  padding: 10px;
  .cmt-item {
    padding: 15px 0;
    + .cmt-item {
      border-top: 1px solid #f8f8f8;
    }
    .cmt-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      .cmt-header-left {
        display: flex;
        align-items: center;
        .avatar {
          width: 40px;
          height: 40px;
          background-color: #f8f8f8;
          border-radius: 50%;
          margin-right: 15px;
        }
        .uname {
          font-size: 12px;
        }
      }
    }
    .cmt-body {
      font-size: 14px;
      line-height: 28px;
      text-indent: 2em;
      margin-top: 6px;
      word-break: break-all;
    }
    .cmt-footer {
      font-size: 12px;
      color: gray;
      margin-top: 10px;
    }
  }
}

/*美化 - 文章详情 - 底部的评论页面 */
// 外层容器

.box1 {
  padding-bottom: 46px;
}
.box2 {
  padding-bottom: 80px;
}

// 发布评论的盒子 - 1
.add-cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  box-sizing: border-box;
  background-color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 46px;
  line-height: 46px;
  padding-left: 10px;
  .ipt-cmt-div {
    flex: 1;
    border: 1px solid #efefef;
    border-radius: 15px;
    height: 30px;
    font-size: 12px;
    line-height: 30px;
    padding-left: 15px;
    margin-left: 10px;
    background-color: #f8f8f8;
  }
  .icon-box {
    width: 40%;
    display: flex;
    justify-content: space-evenly;
    line-height: 0;
  }
}

.child {
  width: 20px;
  height: 20px;
  background: #f2f3f5;
}

// 发布评论的盒子 - 2
.cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 80px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  padding-left: 10px;
  box-sizing: border-box;
  background-color: white;
  textarea {
    flex: 1;
    height: 66%;
    border: 1px solid #efefef;
    background-color: #f8f8f8;
    resize: none;
    border-radius: 6px;
    padding: 5px;
  }
  .van-button {
    height: 100%;
    border: none;
  }
}
</style>
